CVE-2021-26540 (Medium) detected in sanitize-html-1.4.2.tgz

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CVE-2021-26540 - Medium Severity Vulnerability

Vulnerable Library - sanitize-html-1.4.2.tgz

Clean up user-submitted HTML, preserving whitelisted elements and whitelisted attributes on a per-element basis

Library home page: https://registry.npmjs.org/sanitize-html/-/sanitize-html-1.4.2.tgz

Path to dependency file: /package.json

Path to vulnerable library: /node_modules/sanitize-html/package.json

Dependency Hierarchy: - :x: **sanitize-html-1.4.2.tgz** (Vulnerable Library)

Found in base branch: master

Vulnerability Details

Apostrophe Technologies sanitize-html before 2.3.2 does not properly validate the hostnames set by the "allowedIframeHostnames" option when the "allowIframeRelativeUrls" is set to true, which allows attackers to bypass hostname whitelist for iframe element, related using an src value that starts with "/\\example.com".

Publish Date: 2021-02-08

URL: CVE-2021-26540

CVSS 3 Score Details (5.3)

Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: None - Integrity Impact: Low - Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26540

Release Date: 2021-02-08

Fix Resolution: 2.3.2

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